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GBT17241.6-2008

Chinese Standard: 'GBT17241.6-2008'
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GB/T 17241.6-2008
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 23.040.60
J 15
Replacing GB/T 17241.6-1998 and GB/T 2503-1989
Integral Cast Iron Flanges
整体铸铁法兰
ISSUED ON. AUGUST 25, 2008
IMPLEMENTED ON. APRIL 1, 2009
Jointly Issued by. General Administration of Quality Supervision,
Inspection and Quarantine (AQSIQ);
Standardization Administration (SAC) of the People's
Republic of China.
Table of Contents
Foreword ... 3 
1 Scope ... 5 
2 Normative References ... 5 
3 Types and Dimensions ... 5 
4 Technical Requirements ... 19 
No.1 Modification List... 20 
Foreword 
"Cast Iron Pipe Flanges" (GB/T 17241) is divided into 7 parts.
— GB/T 17241.1 Synoptic Table for Cast Iron Pipe Flanges;
— GB/T 17241.2 Cast Iron Pipe Blank Flanges;
— GB/T 17241.3 Hubbed Threaded Cast Iron Pipe Flanges;
— GB/T 27241.4 Hubbed Slip-on-welding and Hubbed Socket Welding Cast Iron
Pipe Flanges;
— GB/T 17241.5 Loose Hubbed Cast Iron Pipe Flanges for Lapped Pipe End;
— GB/T 17241.6 Integral Cast Iron Flanges;
— GB/T 17241.7 Specifications for Cast Iron Pipe Flanges.
This part adopts the relevant parts of ISO 7005-2.1988 "Metallic Flanges - Part 2. Cast
Iron Flanges" by reference. The types and dimensions of the integral cast iron flanges in
this part are consistent with those specified in ISO 7005-2.1988, but compiled in different
formats.
This part is the revision of GB/T 17241.6-1998 "Integral Cast iron Pipe Flanges" and GB/T
2503-1989 "Marine Cast Iron Pipe Flanges".
Compared with the original standard, the main changes of this standard are as follows.
— The original two standards are integrated into one; and the standard name and
compiling format are modified;
— The flange rating marks belonging to American System in the former standard are
modified, e.g. PN20 is marked as Class150, and PN50 is marked as Class300;
— Marking examples are modified.
This standard shall replace GB/T 17241.6-1998 and GB/T 2503-1989, from the
implementation date.
This part was proposed by China Machinery Industry Federation.
This part shall be under the jurisdiction of National Technical Committee on Pipe Fitting of
Standardization Administration of China.
Drafting organizations of this part. China Productivity Center for Machinery, and Zhejiang
Gaoqiangdu Fasteners Co., Ltd.
Participating drafting organizations of this part. China Technology Research & Economy
Development Institute, and Jinan Meide Casting Co., Ltd.
Chief drafting staffs of this part. Li Junying, Luo Fayuan, Ge Haiquan, Feng, and Zang
Guiming.
The previous editions replaced by this part are.
— GB/T 17241.6-1998;
— GB 2503-81 and GB/T 2503-1989.
Integral Cast Iron Flanges
1    Scope 
This part of GB/T 17241 specifies the types and dimensions of the integral gray cast iron,
malleable cast iron and ductile cast iron flanges with the nominal pressure of PN2.5, PN6,
PN10, PN16, PN25, PN40, Class150, and Class300.
This part is applicable to the design, manufacture and acceptance of DN10~DN4000 gray
cast iron, malleable cast iron, and ductile cast iron integral cast iron flanges.
2    Normative References   
The following standards contain provisions which, through reference in this part of GB/T
17241, constitute provisions of this part. For dated reference, the subsequent
amendments (excluding correction) or revisions of these publications do not apply.
However, the parties who enter into an agreement based on this part are encouraged to
investigate the possibility of applying the most recent editions of the standards. For
undated references, the latest edition of the normative document referred to applies.
GB/T 17241.7 Specifications for Cast Iron Pipe Flanges
3    Types and Dimensions   
3.1 The types and dimensions of PN2.5, PN6, PN10, PN16, PN25 and PN40
flanges shall meet the requirements of Figure 1 and Tables 1 ~ 6.
3.2 The types and dimensions of Class150 and Class300 flanges shall meet the
requirements of Figure 1 and Table 7 ~ Table 8.
500 670 620 28 20 M24 582 4 3d 26.5 — 559 12
600 780 725 31 20 M27 682 5 36 30 — 658 12
700 895 840 31 24 M27 794 5 40 32.5 — 772 12
800 1015 950 34 24 M30 901 5 44 35 — 876 12
900 1115 1050 34 28 M30 1001 5 46 37.5 — 976 12
1000 1230 1160 37 28 M33 1112 5 50 40 — 1080 12
1200 1455 1380 40 32 M36 1328 5 56 45 — 1292 12
1400 1675 1590 43 36 M39 1530 5 62 46 — 1496 12
1......
Related standard:   GB 18384-2020  GB/T 13402-2019
   
 
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